Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /opt/lampp/htdocs/forum/flarum/vendor/sycho/sourcemap/tests/classSourceMap/MergeTest.php:15 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/sycho/sourcemap/tests/classSourceMap/MergeTest.php on line 15